1640089 has 4 divisors (see below), whose sum is σ = 1789200. Its totient is φ = 1490980.

The previous prime is 1640083. The next prime is 1640131. The reversal of 1640089 is 9800461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1640089 - 2⁵ = 1640057 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1640083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74539 + ... + 74560.

It is an arithmetic number, because the mean of its divisors is an integer number (447300).

2^1640089 is an apocalyptic number.

It is an amenable number.

1640089 is a deficient number, since it is larger than the sum of its proper divisors (149111).

1640089 is a wasteful number, since it uses less digits than its factorization.

1640089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149110.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1640089 is about 1280.6595956772. The cubic root of 1640089 is about 117.9295039998.

Subtracting from 1640089 its product of nonzero digits (1728), we obtain a palindrome (1638361).

The spelling of 1640089 in words is "one million, six hundred forty thousand, eighty-nine".